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Numerical Simulation and Experimental Study of Regenerative Burner Structure Optimization

Author: DingCuiJiao
Tutor: LiuChaoZuo
School: Huazhong University of Science and Technology
Course: Thermal Power Engineering
Keywords: Regenerative burners Flameless combustion Numerical Simulation Experimental study Optimal design
CLC: TK223.23
Type: Master's thesis
Year: 2009
Downloads: 94
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Abstract


High temperature air combustion technology is a new combustion technology of energy saving and environmental protection, regenerative burners are the most critical components of the new technology, the paper focuses on the optimization of regenerative burner structure to carry out the numerical simulation and experimental study, the results are as follows: Paper for blast furnace gas double preheating regenerative burners steady-state combustion process first constructed a numerical model, the k-ε turbulent flow model, combustion eddy dissipation (Eddy Dissipation Model) model, coupled Monte Carlo radiation heat transfer model, NOX generated using the Zeldovich model. Regenerative combustion of blast furnace gas combustion chemical reaction mechanism were analyzed, the results showed that: Lavrov proposed a single-step overall reaction calculated deviation larger CO results inconsistent with the actual situation, using a two-step contains CO reversible reaction and The vapor reaction mechanism is appropriate. Of the regenerative burners key structure of the combustion process temperature and concentration fields investigated by means of numerical simulation methods, comparative analysis of 12 different burner nozzle combination state combustion results show that: (1 ) burners vents distance 15D ~ 20D adjust and angle in the middle of the level of the overall temperature of the furnace, and the temperature difference between the size of the results of not burning high-temperature zone is mainly concentrated in the furnace, the temperature gradient 3 ° ~ 9 ° between change The temperature distribution is uniform, the temperature inside the furnace central region within 100 ℃. (2) burner nozzle spacing, nozzle angle is not easy to be too large, otherwise there will be incomplete combustion phenomenon. When the the burner orifice spacing is too large, the nozzle angle is not too large nor too small. Comprehensive analysis to determine the the burners structure in the 18D, 5 ° combination of state burning effect of the best, most stable performance. (3) NOX simulation results show that the experimental burner structure can be a very good low NOX generation technology, also reflect low LHV Blast Furnace Gas NOX generated. The detailed study of the experimental results show that the regenerative combustion technology process characteristics: Regenerative Combustion Unlike conventional combustion, the combustion process as a cycle of changes in the non-steady-state process, the furnace temperature and concentration fields with forward to reverse action cyclical changes. The calculated results show that the experimental test values ??compared: accurate simulation results, the furnace temperature field and concentration distribution law with the measured results, the temperature predicted maximum absolute error is less than 50 ℃, the relative error is less than 3%, furnace tail flue gas each component content of CO, O2 and CO2, consistent with the measured values, the NOX emission levels than the measured value is low.

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CLC: > Industrial Technology > Energy and Power Engineering > Steam Power Engineering > Steam boiler > Boiler constructed > Combustion devices > Burner
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